Granted Patent
Utility
US 6,189,565 · App. 09/318,759
Valve with light emitting and detecting and detecting arrangement for monitoring opening and closing of the valve
Inventor:
Goran Skog
Patented Case
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Granted: Feb 20, 2001
Filed: May 26, 1999
Inventor
Goran Skog
Assignee (at issue)
Siemens Elema AB
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.